The ornamental design for a wheel, as shown and described.
FIG. 1 is a perspective view of a wheel showing the claimed design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The broken lines in the figures show portions of the wheel that form no part of the claimed design.
The figures are illustrated to show contrasting appearance. The stipple-shaded portions of the wheel have one appearance, for example that of a reflective material, and the other claimed portions have a different appearance, for example that of a non-reflective material.